Numerical Study on the Solitary Wave Propagating over the Density-Stratified Fluid in a Submarine Trench

孤立波通過凹槽內分層流體之數值研究

吳漢倫(Han-Lun Wu) ； 蕭士俊(Shih-Chun Hsiao) ； 黃煌煇(Hwung-Hweng Hwung)

《海洋工程學刊》 13卷4期 (2013/12) Pp. 295-310

https://doi.org/10.6266/JCOE.2013.1304.01

摘要

本研究主要是利用數值模式，模擬並探討當孤立波通過凹槽內分層流體時，所引發的密度流傳遞、流場和渦度的變化現象。應用流體體積法（VOF）追蹤凹槽內部流體傳遞的現象，並和過去的實驗資料做比較藉此確認本文數值模式之適用性。並再藉由此模式探討當孤立波通凹槽內部分層流體時在不同密度條件下的傳遞行為。再經由數值模式之結果討論密度流傳遞時對於流場以及渦度場的影響和變化。此外本文也針對在不同入射波高條件下，對於不同密度流造成的傳遞和流場變化做更進一步的研究。

關鍵字

孤立波 ； 分層流體 ； 凹槽 ； 傳輸過程

並列摘要

The induced density-stratified fluid motion for a solitary wave past a submarine trench is investigated numerically by means of the three-dimensional Navier-Stokes (N-S) solver named Truchas. The Volume of Fluid (VOF) method is used to trace the free surface and the transport of the lower fluid (homogeneous/dense fluid) within the trench. The numerical results were validated by comparing the computed results with laboratory experiments of Chang et al. (2011) for solitary wave induced flow motion. The model is then used to examine the transport processes of the various dense fluids within the trench. Particular attentions are paid to the evolution of vortex induced by solitary wave. Specifically, the effects of various amplitudes of the incident solitary wave on flow field characteristics are examined.

並列關鍵字

solitary wave ； density-stratified fluid ； submarine trench ； transport processes